Operation

- When crankshaft position sensor signal is input to engine control module, engine control module makes ON-OFF control of ignition power transistor one by one.

- When ignition power transistor A is turned from ON to OFF, the spark plugs of No. 1 and No. 4 cylinders spark. Turning of ignition power transistor B from ON to OFF will produce sparking in spark plugs of No. 2 and No. 3 cylinders.

- The rest of operation is the same as described for SOHC engine.